Instead of one big test which tests multiple functions, split the unit
test into multiple smaller tests.
Also, use TestWithZone instead of TestWithIsolate, because the isolate
is never used.

R=jkummerow@chromium.org

Bug: v8:12425
Change-Id: I32148e40b5ed2b006cc647d42bdfe564ccc6d0ed
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3776676
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81852}